Grammy-winning producer Sidney "Omen" Brown -- who worked with artists like Drake , Beyoncé , Lil Wayne and more -- passed away last year ... and now his cause of death has been released. According to the medical examiner, Brown passed away from atherosclerotic cardiovascular disease. The manner of death was determined as natural. The disease -- otherwise known as ASCVD -- is caused by plaque buildup in your arteries. As we reported ... Brown's body was found by a relative inside his Harlem,